Add a "zip" action to join two arrays

[claussI]

See http://stackoverflow.com/questions/22015684/how-do-i-zip-two-arrays-in-javascript

To compute expressions involving the values of two arrays, it would be great to be able to join the two same-length arrays.

Example:

{
  "publiPerYear": [
    {"_id":"2007","value":538},
    {"_id":"2008","value":577},
    {"_id":"2009","value":611},
    {"_id":"2010","value":548},
    {"_id":"2011","value":567},
    {"_id":"2012","value":608}],
  "citationsPerYear": [
    {"_id":"2007","value":7681},
    {"_id":"2008","value":5479},
    {"_id":"2009","value":5043},
    {"_id":"2010","value":3698},
    {"_id":"2011","value":2927},
    {"_id":"2012","value":2049}]
}

We would like to divide citationsPerYear[i] by publiPerYear[i]:

{
  "zip": [ "citationsPerYear", "publiPerYear" ],
  "foreach": {
    "compute": "this.citationsPerYear / this.publiPerYear"
  }
}

In this example, "zip": [ "citationsPerYear", "publiPerYear" ] should return:

[
    {"_id":"2007","citationsPerYear":7681, "publiPerYear": 538},
    {"_id":"2008","citationsPerYear":5479, "publiPerYear": 577},
    {"_id":"2009","citationsPerYear":5043, "publiPerYear": 611},
    {"_id":"2010","citationsPerYear":3698, "publiPerYear": 548},
    {"_id":"2011","citationsPerYear":2927, "publiPerYear": 567},
    {"_id":"2012","citationsPerYear":2049, "publiPerYear": 608}]